The Kochs operate oil refineries in Alaska, Texas, and Minnesota, and control some four thousand miles of pipeline. Koch Industries owns Brawny paper towels, Dixie cups, Georgia-Pacific lumber, Stainmaster carpet, and Lycra, among other products. Forbes ranks it as the second-largest private company in the country, after Cargill, and its consistent profitability has made David and Charles Koch—who, years ago, bought out two other brothers—among the richest men in America. Their combined fortune of thirty-five billion dollars is exceeded only by those of Bill Gates and Warren Buffett.

The Kochs are longtime libertarians who believe in drastically lower personal and corporate taxes, minimal social services for the needy, and much less oversight of industry—especially environmental regulation. These views dovetail with the brothers’ corporate interests. In a study released this spring, the University of Massachusetts at Amherst’s Political Economy Research Institute named Koch Industries one of the top ten air polluters in the United States. And Greenpeace issued a report identifying the company as a “kingpin of climate science denial.” The report showed that, from 2005 to 2008, the Kochs vastly outdid ExxonMobil in giving money to organizations fighting legislation related to climate change, underwriting a huge network of foundations, think tanks, and political front groups. Indeed, the brothers have funded opposition campaigns against so many Obama Administration policies—from health-care reform to the economic-stimulus program—that, in political circles, their ideological network is known as the Kochtopus.

Mayer’s article discusses some ugly family roots. Father Fred did business with Stalin, but later came to regret it, and became one of the original members of the John Birch Society.

He wrote admiringly of Benito Mussolini’s suppression of Communists in Italy, and disparagingly of the American civil-rights movement. “The colored man looms large in the Communist plan to take over America,” he warned. Welfare was a secret plot to attract rural blacks to cities, where they would foment “a vicious race war.” In a 1963 speech that prefigures the Tea Party’s talk of a secret socialist plot, Koch predicted that Communists would “infiltrate the highest offices of government in the U.S. until the President is a Communist, unknown to the rest of us.”

Mayer’s piece discusses the links between Fred’s views and those of his sons. Buried deep in the article is an example of how money trumps everything. David Koch, a prostate cancer survivor, has given generously to cancer research.

Koch’s corporate and political roles, however, may pose conflicts of interest. For example, at the same time that David Koch has been casting himself as a champion in the fight against cancer, Koch Industries has been lobbying to prevent the E.P.A. from classifying formaldehyde, which the company produces in great quantities, as a “known carcinogen” in humans.